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CN110473898B - Organic light emitting diode display panel and manufacturing method thereof - Google Patents

Organic light emitting diode display panel and manufacturing method thereof Download PDF

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Publication number
CN110473898B
CN110473898B CN201910695007.2A CN201910695007A CN110473898B CN 110473898 B CN110473898 B CN 110473898B CN 201910695007 A CN201910695007 A CN 201910695007A CN 110473898 B CN110473898 B CN 110473898B
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sub
pixel
layer
cathode
display panel
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CN110473898A (en
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孙佳佳
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to CN201910695007.2A priority Critical patent/CN110473898B/en
Priority to PCT/CN2019/119311 priority patent/WO2021017322A1/en
Priority to US16/632,901 priority patent/US11228014B2/en
Publication of CN110473898A publication Critical patent/CN110473898A/en
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
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    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
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    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape
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    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80524—Transparent cathodes, e.g. comprising thin metal layers
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    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
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    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
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    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
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Abstract

The invention discloses an organic light-emitting diode display panel and a manufacturing method thereof, the number of thin film transistors in an array layer below a camera area under a screen is reduced, the number of metal wiring is reduced, the integral light transmittance of the array layer is improved, and meanwhile, a cathode layer at a corresponding position of the camera area under the screen is subjected to patterning treatment, so that the light transmittance of the cathode layer is improved, and the organic light-emitting diode display panel in the camera area under the screen can also normally display while the camera area under the screen is clearly imaged.

Description

Organic light emitting diode display panel and manufacturing method thereof
Technical Field
The invention belongs to the field of flexible display, and particularly relates to an organic light emitting diode display panel and a manufacturing method thereof.
Background
Compared with the conventional Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED) device has the advantages of Light weight, wide viewing angle, fast response time, low temperature resistance, high luminous efficiency and the like, so that the OLED device is always considered as a next-generation novel Display technology in the Display industry, and particularly, the OLED can be made into a flexible Display screen capable of being bent on a flexible substrate, which is a great advantage of an OLED Display panel. In order to improve the screen occupation ratio of the OLED Panel, Panel manufacturers successively push out products such as holes in the screen, a front Camera is placed below the hole, and sufficient light is provided when the front Camera is imaged by removing an OLED film layer in a Camera Under Panel (CUP) area, so that normal imaging of the front Camera is realized. However, since the OLED film layer in the CUP region is removed, the picture cannot be displayed in this region.
Therefore, there is a need to develop an OLED panel that can display the CUP area to realize a true "CUP full screen".
Disclosure of Invention
According to an aspect of the present invention, there is provided an organic light emitting diode display panel provided with an off-screen camera area including a plurality of pixel units, the display panel further including: a flexible substrate; the array layer is arranged on the flexible substrate, and only one thin film transistor is arranged at the corresponding position of each pixel unit; the anode layer is arranged on the array layer and is connected with the thin film transistor; the pixel definition layer and the organic light emitting layer are arranged on the anode layer at intervals; and a cathode layer disposed on the pixel defining layer and the organic light emitting layer, the cathode layer including a patterned cathode portion and a non-patterned cathode portion, wherein the patterned cathode portion is located corresponding to the under-screen camera area.
Furthermore, the organic light emitting diode display panel further comprises an encapsulation layer covering the cathode layer.
Further, each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and anodes corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel are connected with each other through the anode layer.
Further, the first sub-pixel is a green sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel is a red sub-pixel, where the number of the first sub-pixels is two, the number of the second sub-pixels is one, and the number of the third sub-pixels is one.
Further, the patterned cathode portion includes a plurality of sub-cathode portions respectively corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel in the pixel unit, each of the sub-cathode portions being connected to each other; the patterned cathode portion and the non-patterned cathode portion are connected to each other.
According to another aspect of the present invention, the present invention further provides a method for manufacturing an oled display panel, the method being applied to an oled display panel, wherein a sub-screen camera area is disposed on the oled display panel, the sub-screen camera area includes a plurality of pixel units, and the method includes the following steps: providing a flexible substrate; forming an array layer on the flexible substrate, wherein only one thin film transistor is arranged at the corresponding position of each pixel unit on the array layer; forming an anode layer on the array layer; forming a pixel defining layer and an organic light emitting layer on the anode layer; forming a cathode layer on the pixel defining layer and the organic light emitting layer, and forming a patterned cathode portion and a non-patterned cathode portion on the cathode layer, wherein the patterned cathode portion is located corresponding to the under-screen camera area; and forming an encapsulation layer on the cathode layer, covering the cathode layer.
Further, the anode layer is connected with the thin film transistor through a via hole arranged in the array layer.
Further, each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and anodes corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel are connected with each other through the anode layer.
Further, the first sub-pixel is a green sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel is a red sub-pixel, where the number of the first sub-pixels is two, the number of the second sub-pixels is one, and the number of the third sub-pixels is one.
Further, the patterned cathode portion includes a plurality of sub-cathode portions respectively corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel in the pixel unit, each of the sub-cathode portions being connected to each other; the patterned cathode portion and the non-patterned cathode portion are connected to each other.
According to the invention, the number of Thin Film Transistors (TFTs) in the array layer below the CUP region is reduced, the number of metal wiring lines is reduced, so that the overall light transmittance of the array layer is improved, and meanwhile, the cathode layer at the corresponding position of the CUP region is subjected to patterning treatment, so that the light transmittance of the cathode layer is improved, so that the clear imaging of the CUP region is realized, and meanwhile, the OLED display panel in the CUP region can also normally display.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an organic light emitting diode display panel according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a cathode layer under the CUP region according to an embodiment of the present invention.
Fig. 3a is a schematic structural diagram of a connection manner of the cathode layer under the CUP region according to an embodiment of the present invention.
Fig. 3b is a schematic structural diagram of a connection manner of the anode layer under the CUP region according to an embodiment of the present invention.
Fig. 4a is a schematic structural diagram of a connection manner of the cathode layer under the CUP region according to another embodiment of the present invention.
Fig. 4b is a schematic structural diagram of a connection manner of the anode layer under the CUP region according to another embodiment of the present invention.
Fig. 5a is a schematic structural diagram of a connection manner of the cathode layer under the CUP region according to another embodiment of the present invention.
Fig. 5b is a schematic structural diagram of a connection manner of the anode layer under the CUP region according to another embodiment of the present invention.
Fig. 6 is a schematic flow chart illustrating a method for manufacturing an organic light emitting diode display panel according to an embodiment of the present invention.
Fig. 7 to 12 are schematic diagrams illustrating a method for forming an organic light emitting diode display panel according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the description of the invention herein, the drawings discussed below and the various embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed to limit the scope of the present disclosure. Those skilled in the art will understand that the principles of the present invention may be implemented in any suitably arranged system. Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. Further, a terminal according to an exemplary embodiment will be described in detail with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements.
The terms used in the description of the present invention are only used to describe specific embodiments, and are not intended to show the concept of the present invention. Unless the context clearly dictates otherwise, expressions used in the singular form encompass expressions in the plural form. In the present specification, it is to be understood that terms such as "comprising," "having," and "containing" are intended to specify the presence of stated features, integers, steps, acts, or combinations thereof, as taught in the present specification, and are not intended to preclude the presence or addition of one or more other features, integers, steps, acts, or combinations thereof. Like reference symbols in the various drawings indicate like elements.
As shown in fig. 1, an embodiment of the present invention provides an organic light emitting diode display panel, including: the pixel structure comprises a flexible substrate 1, an array layer 2, a thin film transistor 3, a source drain electrode 31, a grid electrode 32, an anode 4, a pixel definition layer 5, an organic light emitting layer 6, a first sub-pixel 61, a second sub-pixel 62, a third sub-pixel 63, a cathode layer 7 and an encapsulation layer 8.
The organic light emitting diode display panel is provided with a camera area under a screen, and the camera area under the screen comprises a plurality of pixel units. The pixel unit includes an anode layer 4, a pixel defining layer 5, an organic light emitting layer 6 and a cathode layer 7. Each pixel unit includes a first sub-pixel 61, a second sub-pixel 62 and a third sub-pixel 63, the first sub-pixel 61 provided in this embodiment is a green sub-pixel, the second sub-pixel 62 is a blue sub-pixel, and the third sub-pixel 63 is a red sub-pixel, where the number of the first sub-pixels 61 is two, the number of the second sub-pixels 62 is one, and the number of the third sub-pixels 63 is one. It should be noted that the arrangement of the pixels is not limited to the manner provided in this embodiment, and may be any other manner.
The array layer 2 is arranged on the flexible substrate 1, the array layer 2 is located corresponding positions of the pixel units and is only provided with the thin film transistor 3, the number of metal wiring lines can be reduced, the overall light transmittance of the array layer 2 is improved, and therefore when the CUP region is clearly imaged, the OLED display panel in the CUP region can also normally display. The thin film transistor 3 includes a source/drain 31 and a gate 32, and the array layer 2 is provided with a via hole at a position corresponding to the source/drain 31, so as to be conveniently connected to the anode layer 4.
The anode layer 4 is disposed on the array layer 2 and connected to the source/drain 31 of the thin film transistor 3 through a via hole disposed in the array layer 2. The anode layer 4 connects the anodes corresponding to the first sub-pixel 61, the second sub-pixel 62 and the third sub-pixel 63, respectively, so that the four sub-pixels which can independently emit light originally become to emit light simultaneously, that is, two green sub-pixels, one blue sub-pixel and one red sub-pixel emit light simultaneously, and the light is white light. Because the sub-pixels in the pixel units in the CUP area are all on or off at the same time, the display in the area is black and white, the display can be applied to a status bar above the OLED panel and can be used for displaying patterns such as electric quantity, 4G signals, alarm clocks, Bluetooth and the like.
The pixel defining layer 5 and the organic light emitting layer 6 are disposed on the anode layer 4 at an interval.
The cathode layer 7 is disposed on the pixel defining layer 5 and the organic light emitting layer 6, and the cathode layer 7 includes a patterned cathode portion 71 and a non-patterned cathode portion 72, as shown in fig. 2. The position of the patterned cathode portion 71 corresponds to the area of the camera under the screen, the cathode layer 7 is subjected to patterning treatment, so that the light transmittance of the cathode layer 7 is improved, clear imaging of the CUP area is achieved, and meanwhile the OLED display panel in the CUP area can also normally display. In the prior art, the cathode is a metal layer, the whole surface is coated with a film, and the light transmittance is only 40%. In the present invention, the cathode is patterned to improve the light transmittance of the cathode layer 7.
In the embodiment of the present invention, the patterned cathode portion 71 includes a plurality of sub-cathode portions, and the sub-cathode portions respectively correspond to the first sub-pixel 61, the second sub-pixel 62 and the third sub-pixel 63 in the pixel unit, and each sub-cathode portion is connected to each other, so as to keep the characteristic that the cathodes of the original sub-pixels are connected to each other. The edges of the patterned cathode portion 71 are connected to the non-patterned cathode portion 72, thereby ensuring that the entire cathode layer 7 of the OLED display panel is connected to each other.
As shown in fig. 3a, the cathodes of the sub-pixels under the CUP region may be connected in a straight line. As shown in FIG. 3b, the anodes of the sub-pixels under the CUP region can be connected in a straight line.
As shown in FIG. 4a, the cathodes of the sub-pixels under the CUP region may be connected non-linearly. As shown in FIG. 4b, the anodes of the sub-pixels under the CUP region can be connected in a straight line.
As shown in fig. 5a, the cathodes of the sub-pixels under the CUP region may be connected non-linearly. As shown in FIG. 5b, the anodes of the sub-pixels under the CUP region can be connected in a very non-linear manner.
As shown in fig. 6, a method for manufacturing an led display panel is provided, where the method is applied to an oled display panel, and a sub-screen camera area is disposed on the oled display panel, and the sub-screen camera area includes a plurality of pixel units. The manufacturing method comprises the following steps:
step S10 provides a flexible substrate, as shown in fig. 7.
Step S20 is to form an array layer on the flexible substrate, and only one thin film transistor is disposed at a position corresponding to the pixel unit on the array layer, as shown in fig. 8.
Specifically, only one thin film transistor is arranged at the corresponding position of the pixel unit on the array layer, the number of metal wires is reduced, and therefore the overall light transmittance of the array layer 2 is improved, clear imaging of the CUP region is achieved, and meanwhile the OLED display panel in the CUP region can also display normally. The thin film transistor 3 includes a source/drain 31 and a gate 32, and the array layer 2 is provided with a via hole at a position corresponding to the source/drain 31, so as to be conveniently connected to the anode layer 4.
Step S30 forms an anode layer on the array layer, as shown in fig. 9. The anode layer 4 is connected to the thin film transistor 3 through a via hole disposed in the array layer 2.
In addition, the anode layer 4 may be formed by etching or masking to connect the anodes of the first sub-pixel 61, the second sub-pixel 62, and the third sub-pixel 63 with each other, so that the four sub-pixels capable of emitting light independently originally become to emit light simultaneously, that is, two green sub-pixels, one blue sub-pixel, and one red sub-pixel emit light simultaneously, and the light is white light. Because the sub-pixels in the pixel units in the CUP area are all on or off at the same time, the display in the area is black and white, the display can be applied to a status bar above the OLED panel and can be used for displaying patterns such as electric quantity, 4G signals, alarm clocks, Bluetooth and the like.
Step S40 is to form a pixel defining layer and an organic light emitting layer on the anode layer, as shown in fig. 10.
Step S50 forms a cathode layer on the pixel defining layer and the organic light emitting layer, and forms a patterned cathode portion and a non-patterned cathode portion on the cathode layer, wherein the patterned cathode portion is located corresponding to the under-screen camera area, as shown in fig. 11.
In which the cathode layer 7 is etched or masked to obtain a patterned cathode portion 71 and an unpatterned cathode portion 72, as shown in fig. 2. The position of the patterned cathode portion 71 corresponds to the area of the camera under the screen, the cathode layer 7 is subjected to patterning treatment, so that the light transmittance of the cathode layer 7 is improved, clear imaging of the CUP area is achieved, and meanwhile the OLED display panel in the CUP area can also normally display. In the prior art, the cathode is a metal layer, the whole surface is coated with a film, and the light transmittance is only 40%. In the present invention, the cathode is patterned to improve the light transmittance of the cathode layer 7.
In the embodiment of the present invention, the patterned cathode portion 71 includes a plurality of sub-cathode portions, and the sub-cathode portions respectively correspond to the first sub-pixel 61, the second sub-pixel 62 and the third sub-pixel 63 in the pixel unit, and each sub-cathode portion is connected to each other, so as to keep the characteristic that the cathodes of the original sub-pixels are connected to each other. The edges of the patterned cathode portion 71 are connected to the non-patterned cathode portion 72, thereby ensuring that the entire cathode layer 7 of the OLED display panel is connected to each other.
Step S60 forms an encapsulation layer on the cathode layer, covering the cathode layer, as shown in fig. 12. The encapsulation layer 8 serves to prevent the cathode layer 7 from being corroded.
According to the invention, the light transmittance of the whole array layer is improved by reducing the number of thin film transistors in the array layer below the CUP region and the number of metal wires, and meanwhile, the cathode layer at the corresponding position of the CUP region is subjected to patterning treatment to improve the light transmittance of the cathode layer, so that the clear imaging of the CUP region is realized, and meanwhile, the OLED display panel in the CUP region can also normally display.
The organic light emitting diode display panel and the method for manufacturing the same provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. The utility model provides an organic light emitting diode display panel which characterized in that, display panel is equipped with a camera region under the screen, camera region includes a plurality of pixel unit under the screen, display panel still includes:
a flexible substrate;
the array layer is arranged on the flexible substrate, and only one thin film transistor is arranged at the corresponding position of each pixel unit;
the anode layer is arranged on the array layer and is connected with the thin film transistor;
the pixel definition layer and the organic light emitting layer are arranged on the anode layer at intervals; and
and the cathode layer is arranged on the pixel defining layer and the organic light emitting layer and comprises a patterned cathode part and a non-patterned cathode part, wherein the position of the patterned cathode part corresponds to the area of the under-screen camera.
2. The oled display panel of claim 1, further comprising an encapsulation layer overlying the cathode layer.
3. The OLED display panel of claim 1, wherein each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and anodes of the first sub-pixel, the second sub-pixel and the third sub-pixel are connected to each other through the anode layer.
4. The OLED display panel of claim 3, wherein the first sub-pixel is a green sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel is a red sub-pixel, wherein the number of the first sub-pixels is two, the number of the second sub-pixels is one, and the number of the third sub-pixels is one.
5. The OLED display panel of claim 4, wherein the patterned cathode portion comprises a plurality of sub-cathode portions corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel in the pixel unit, respectively, each of the sub-cathode portions being connected to each other; the patterned cathode portion and the non-patterned cathode portion are connected to each other.
6. A manufacturing method of an organic light emitting diode display panel is characterized in that the manufacturing method is suitable for an organic light emitting diode display panel, wherein a lower-screen camera area is arranged on the organic light emitting diode display panel and comprises a plurality of pixel units, and the manufacturing method comprises the following steps:
providing a flexible substrate;
forming an array layer on the flexible substrate, wherein only one thin film transistor is arranged at the corresponding position of each pixel unit on the array layer;
forming an anode layer on the array layer;
forming a pixel definition layer and an organic light emitting layer on the anode layer, wherein the pixel definition layer and the organic light emitting layer are arranged on the anode layer at intervals; and
forming a cathode layer on the pixel defining layer and the organic light emitting layer, and forming a patterned cathode portion and a non-patterned cathode portion on the cathode layer, wherein the patterned cathode portion is located corresponding to the under-screen camera area; and
and forming an encapsulation layer on the cathode layer to cover the cathode layer.
7. The method of claim 6, wherein the anode layer is connected to the thin film transistor through a via hole disposed in the array layer.
8. The method according to claim 6, wherein each pixel unit comprises a first sub-pixel, a second sub-pixel and a third sub-pixel, and anodes corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel are connected to each other through the anode layer.
9. The method of claim 8, wherein the first sub-pixel is a green sub-pixel, the second sub-pixel is a blue sub-pixel, and the third sub-pixel is a red sub-pixel, wherein the number of the first sub-pixels is two, the number of the second sub-pixels is one, and the number of the third sub-pixels is one.
10. The method of claim 8, wherein the patterned cathode portion comprises a plurality of sub-cathode portions respectively corresponding to the first sub-pixel, the second sub-pixel and the third sub-pixel in the pixel unit, and each of the sub-cathode portions is connected to each other; the patterned cathode portion and the non-patterned cathode portion are connected to each other.
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